The correct calculation is 0.156 x 14 not 140 (the formula given earlier was 0.156 psi/10 ft.).
So your loss through 140 ft. of cement lined ductile iron would be 2.2 psi at 1,560 gpm. [that loss per foot of DI pipe seems a little high to me, but its prolly good enough for these purposes] Mark A. Sornsin, PE Fire Protection Engineer Ulteig Engineers, Inc. Fargo, ND Direct: 701. 280.8591 [email protected] -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Greg McGahan Sent: Thursday, August 06, 2009 1:37 PM To: [email protected] Subject: RE: water storage tank You are correct....the answer I got was "we don't know"........from the horse's mouth. Thanks for all of your help, I will let you know how it works out in a few hours. Greg McGahan Operations Manager Living Water Fire Protection 1160 McKenzie Road P.O. Box 877 Cantonment, Florida 32533 (850) 937.1850 | Fax (850) 937.1852 | Cell (850) 554.3231 [email protected] -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Todd Williams Sent: Thursday, August 06, 2009 11:04 AM To: [email protected] Subject: RE: water storage tank Someone designed a water tank and they can't tell you the output? Who sold that design contract? At 11:18 AM 8/6/2009, you wrote: >I am getting info piecemeal from the engineering firm that is in >charge of the tower. They say they don't >Know what the residual pressure and flow will be when the tower is >completed. We have a sprinkler system going in "next door" to the >tower using the existing water from the old system. However, they >have installed a 4" pipe with a hydrant instead of 6" (many years >ago)and nobody knew until we dug it up. > >Now we are flowing 600 gpm through a 4" pipe to our source and the >calcs are too close for comfort. We are looking for a "guesstimate" >of the available water at the base of the tower without any fittings >or valves. I can add them in the 8" line from the base to the new >tie in point where the systems tie together. We are talking about >needing to pick up 5 to 10 psi not 20 or 30, so as long as we are >close we should be good. > >This really should fall on the EOR, but as is often the case in this >region, if we want to finish the job on time, we have to get an >answer immediately. > >So I can say that I should reasonably be able to expect .156 x 140' >= 22 lbs of loss from the tank to the bottom w/o >fittings....therefore if we say we should reasonably expect 1,500 >gpm at 35 psi? > _______________________________________________ Sprinklerforum mailing list http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum For Technical Assistance, send an email to: [email protected] To Unsubscribe, send an email to:[email protected] (Put the word unsubscribe in the subject field)
